上海中心大厦考虑施工过程的竖向变形及差异分析与研究

Analysis and Research of Vertical Deformation Difference of Shanghai Tower Considering Construction Process

根据CEB-FIP 1990规范中关于混凝土收缩、徐变的规定,按照施工顺序建模加载,考虑混凝土收缩徐变、施工标高调整、伸臂桁架连接固定时间、竖向钢构件预调整量等因素,结合结构高度580 m的上海中心大厦超高层建筑结构,分析计算了超高层结构中巨型柱与核心筒剪力墙的竖向变形及差异。分析表明,在重力荷载作用下,上海中心塔楼结构封顶一年后巨型柱最大竖向变形123 mm,核心筒翼墙最大变形141 mm,均发生在84层;最大变形差发生在101层,为22 mm。同时对影响竖向变形的计算假定进行了深入研究,给出了符合工程实践的建议。采取滞后终固的方法可以降低由于柱墙竖向变形差异导致的伸臂桁架内力。

The vertical deformation difference of a high-rise building was analyzed combining with Shanghai Tower,of which roof is 580 meters high,according to construction sequence and provisions about concrete creep and shrinkage in CEB-FIP 1990 code.In analysis,the factors such as creep and shrinkage of concrete,construction adjustment,fix time of outriggers,and preset of steel components and etc.were all considered.The results of analysis indicated that mega columns will reach the maximum vertical deformation of 123 mm,while reinforced concrete core shear wall will occurr the maximum vertical deformation of 141 mm on the 84th floor one year after the structure roof is constructed.The maximum vertical deformation difference between mega columns and shear walls will happen on 101th floor,which is about 22 mm.Meanwhile,more researches have been carried on in the field of calculation assumptions with effects on vertical deformation,and advices in accordance with engineering practice have been given.It was pointed out that internal force in outriggers could be reduced by delaying the fix time.